The full transmit power signals then pass through a second bank of bandpass filters.

The CLAC apparatus passes low powered transmit signals through a bank of bandpass filters.

The method and apparatus is particularly effective when the filter bank operates on a linear-prediction residual (150).

The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal.

Air sampling ports and prefilters may be provided.

The filter may be a V-bank filter, for example.

Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.

The filter can occupy less space and in some embodiments 1/2 or even less space than a corresponding V-Bank filter with comparable performance.

A non-V bank filter for an animal confinement application such as for filtering out the porcine reproductive and respiratory syndrome virus (PRRSV) is provided.

a front-mounted collection chute specific to each filter and a part of the collection channel shared by the filter battery.

In one embodiment, a bank of cyclically shifted filters (502) determined with reference to the conventional matched filter (401) for CDMA is used to demodulate the channel signal.

The final output is obtained from a synthesis filter bank that synthesizes the subband signals after echo cancellation and noise reduction into a full-band signal.

An echo canceller (10) includes an analysis filter bank (24) for dividing a send-input signal (SI) and a receive-input signal (RI) into subband send-input signals (SC1-SC16) and subband receive signals (RC1-RC16).